Now showing items 53-72 of 345
Raschellà, Alessandro (Date of defense: 2015-05-27)
Cognitive Radio (CR) paradigm represents an innovative solution to mitigate the spectrum scarcity problem by enabling Dynamic Spectrum Access (DSA), defined in order to conciliate the existing conflicts between the ...
Berbakov, Lazar (Date of defense: 2013-07-11)
In recent years, wireless sensor networks have attracted considerable attention in the research community. Their development, induced by technological advances in microelectronics, wireless networking and battery fabrication, ...
Valles Sales, Araceli (Date of defense: 2014-09-25)
The development of new materials impacts on all branches of engineering and, in particular, in aerospace engineering. Metallic glasses (MG) are relatively newcomers to the world of materials science and have excellent ...
Pastore, Adriano (Date of defense: 2014-07-26)
The present thesis studies information rates for reliable transmission of information over fading channels in the realistic situation where the receiver has only imperfect channel-state knowledge. Of particular interest ...
Lagunas Targarona, Eva (Date of defense: 2014-03-07)
Signal acquisition is a main topic in signal processing. The well-known Shannon-Nyquist theorem lies at the heart of any conventional analog to digital converters stating that any signal has to be sampled with a constant ...
Salvador, Amaia (Date of defense: 2019-06-27)
In the past decade, deep neural networks have revolutionized computer vision. High performing deep neural architectures trained for visual recognition tasks have pushed the field towards methods relying on learned image ...
Marojevic, Vuk (Date of defense: 2010-10-09)
Our research aims at contributing to the evolution of modern wireless communications and to the development of software-defined radio (SDR) and cognitive radio, in particular. It promotes a general resource management ...
Kumar, Dhiraj (Date of defense: 2012-07-16)
The increasing need for range-resolved aerosol and water-vapour atmospheric observation networks worldwide has given rise to multi-spectral LIDARs (Light Detection and Ranging, a synonym of laser radar) as advanced remote ...
Najár Martón, Montserrat (Date of defense: 1996-10-25)
La tesis propone un nuevo conformador de haz para la recepción de señales con modulación de saltos frecuenciales "frequency hopping" (FH) basado en el conocimiento de la secuencia de frecuencias utilizada en la modulación ...
Ferrús Ferré, Ramon (Date of defense: 2000-01-19)
La estandarización del esquema de acceso radio para los futuros sistemas de telecomunicación está a punto de ser una realidad. En el calendario propuesto por ITU para llevar a cabo la elaboración del estándar, se prevé que ...
Umbert Juliana, Anna (Date of defense: 2004-10-06)
Els sistemes de comunicacions mòbils de segona generació (2G) estan dirigits a donar servei de veu amb una qualitat acceptable. L'evolució de les necessitats dels usuaris cap a aplicacions multimedia fa necessari incorporar ...
Pérez Romero, Jordi (Date of defense: 2001-04-23)
La presente tesis doctoral se enmarca dentro del sector de las comunicaciones móviles, y en particular de los denominados sistemas de tercera generación, que se plantean como objetivo el poder ofrecer una gran diversidad ...
Montoro López, Gabriel (Date of defense: 1996-11-14)
En esta Tesis se tratan varios aspectos relacionados con la linealización de sistemas no lineales. Las dificultades inherentes al empleo de técnicas de análisis, modelado y control de sistemas no lineales, son debidas en ...
Torres Torres, Francesc (Date of defense: 1992-11-18)
El objetivo de la tesis es estudiar en términos del ruido de fase, el diseño de osciladores de microondas sintetizados. La tesis realiza una revisión tecnológica de los componentes habitualmente empleados, en términos de ...
Durán Martínez, Israel (Date of defense: 2017-11-20)
This work has been formally undertaken within the frame of the scholarship number BES-2012-053917 of 1 December 2012, by the "Secretario de Estado de Investigación del Ministerio de Economía y Competitividad" related to ...
Pham, Thi Quynh Anh (Date of defense: 2019-12-18)
The power efficiency and linearity of radio frequency (RF) power amplifiers (PAs) are critical in wireless communication systems. The main scope of PA designers is to build the RF PAs capable to maintain high efficiency ...
Bernardo Alvarez, Francisco (Date of defense: 2010-06-01)
La próxima cuarta generación (4G) de redes de comunicaciones móviles celulares considera una interfaz radio basada en OFDMA (Orthogonal Frequency Division Multiple Access). Esta tecnología ofrece robustez a la propagación ...
Lort Cuenca, Marc (Date of defense: 2017-11-17)
Mankind's way of life is the main driver of a planetary-scale change that is marked by the growing of human population's demand of energy, food, goods, services and information. As a result, it have emerged new ecological, ...
Gelabert Doran, Xavier (Date of defense: 2010-07-12)
Las redes inal´ambricas actuales exhiben caracter´ısticas heterog´eneas de acceso m´ultiple mediante el despliegue, la coexistencia y la cooperaci´on de varias Tecnolog ´ıas de Acceso Radio (RAT2). En este escenario, la ...
Galeana Zapién, Hiram (Date of defense: 2011-02-25)
La interfaz radio de los sistemas de comunicaciones móviles es normalmente considerada como la única limitación de capacidad en la red de acceso radio. Sin embargo, a medida que se van desplegando nuevas y más eficientes ...